P2E43 code meaning
Hybrid/EV Electronics Coolant Pump B Control Circuit Low
Powertrain system Generic code P2Exx codes Check engine light
What P2E43 means
P2E43 means the command signal of electronics coolant pump B sits too low, typically because the line has contact with ground or the output stage cannot drive it up. On PWM-controlled pumps this usually stops the pump outright. Pierburg's CWA pumps, a widespread design, read a duty cycle of 0 to 1 % as stop and pull their PWM input to ground through 10 kΩ, so a grounded line leaves the rotor standing. Ford's 2024 summary treats circuit low (fault type 11) on its auxiliary pumps as a report from the smart driver, checked over 5 s at a battery voltage of at least 11 V. GM's 2016 hybrid tables fold grounded, voltage-shorted and open lines into a single pump A code, P0CE9. No manufacturer publicly documents P2E43. Chafed insulation and wet connectors are usual finds. The high-side code is P2E44, pump A's version P0CEB.
P2E43 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E43
- Pump B stops, electronics coolant heats up
- MIL with hybrid or drive system message
- Limited power or charging rate under load
Common causes of P2E43
- Most likelyControl wire chafed through and shorted to ground
- PossibleMoisture or corrosion bridging pins in the pump connector
- PossibleShorted input stage inside pump B
- Less likelyOutput stage of the module stuck low
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hybrid electronics coolant pump bPower electronics coolant loop
What each part of P2E43 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 43 | The exact fault in that area. |
What to do next
- Note P2E43 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E43
What does P2E43 mean?
P2E43 means "Hybrid/EV Electronics Coolant Pump B Control Circuit Low". P2E43 means the command signal of electronics coolant pump B sits too low, typically because the line has contact with ground or the output stage cannot drive it up. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E43?
Drive gently and only to a workshop. With P2E43 the car can go into limp mode (reduced power) to protect itself.
Will P2E43 fail an emissions test?
Yes, it can. P2E43 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2E43 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2E43 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.